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Why is my craftsman snow blower running inconstantly and surging rpm ?

My craftsman snow blower model no. 247.886911 surges and struggles to maintain rpm. I started it for the first time this winter and it ran full throttle and was stuck there. I shut it off and restarted it a few minutes later and it then ran at the correct rpm but only for 15 seconds before surging. I drained the fuel system, cleaned the carburetor, replaced and gaped the spark plug, and filled with fresh gas. It starts great but begins to surge after 15 seconds every time. It also runs worse as i turn from choke to run position. I tried blowing a little snow with it and it ran at a more stable rpm under load. The service manual does indicate a cause of this may be over-governed engine. If i hold the arm on the governor in place it runs smooth. Does anyone have any solutions on how i can determine if it is still a carburetor issue or a governor issue?

Tags
Craftsman , Electric Snowblowers , Snow Removal Equipment
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5 Answers from these members:
Mark T
Dan,
Thank you for posting what you did to fix the snow blower. I am sure others will take you advice if they have the same problem. To avoid this problem in the future I recommend using a fuel stabilizer in all the fuel you put into the tank. This will prevent the fuel from going bad and fouling up the new carburetor.
Thank you for using Manage my life.
Mark
by Mark T Earned 1,649 community points in Craftsman
January 20th, 2013
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